É. Buchlin
A5088591517- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Solar Radiation and Photovoltaics
- Geomagnetism and Paleomagnetism Studies
- CCD and CMOS Imaging Sensors
- Geophysics and Gravity Measurements
- Spacecraft Design and Technology
- Photocathodes and Microchannel Plates
- Earthquake Detection and Analysis
- Spacecraft and Cryogenic Technologies
- Distributed and Parallel Computing Systems
- Astronomy and Astrophysical Research
- Market Dynamics and Volatility
- Gamma-ray bursts and supernovae
- Fluid Dynamics and Turbulent Flows
- Complex Systems and Time Series Analysis
- Climate variability and models
- Advanced Image Processing Techniques
- Experimental and Theoretical Physics Studies
- Calibration and Measurement Techniques
- Atmospheric Ozone and Climate
- Computer Graphics and Visualization Techniques
- Adaptive optics and wavefront sensing
Institut d'Astrophysique Spatiale
2013-2023
Université Paris-Saclay
2016-2023
Centre National de la Recherche Scientifique
2012-2023
Université Paris-Sud
2010-2022
Osservatorio Astrofisico di Torino
2020
Arcetri Astrophysical Observatory
2020
Imperial College London
2006-2008
Imperial Valley College
2008
University of Florence
2003-2007
Context. The Extreme Ultraviolet Imager (EUI) is part of the remote sensing instrument package ESA/NASA Solar Orbiter mission that will explore inner heliosphere and observe Sun from vantage points close to out ecliptic. advance “connection science” between solar activity heliosphere. Aims. With EUI we aim improve our understanding structure dynamics atmosphere, globally as well at high resolution, latitude perspectives. Methods. consists three telescopes, Full two High Resolution Imagers,...
The goal of this paper is to study the smallest brightening events observed in EUV quiet Sun. We use commissioning data taken by EUI instrument onboard recently launched Solar Orbiter mission. On 2020 May 30, was situated at 0.556AU from Its HRIEUV telescope 17.4nm passband reached an exceptionally high two-pixel spatial resolution 400km. size and duration small-scale structures determined data, while their height estimated triangulation with simultaneous SDO/AIA data. This first stereoscopy...
The Spectral Imaging of the Coronal Environment (SPICE) instrument is a high-resolution imaging spectrometer operating at extreme ultraviolet (EUV) wavelengths. In this paper, we present concept, design, and pre-launch performance facility on ESA/NASA Solar Orbiter mission. goal paper to give prospective users better understanding possible types observations, data acquisition, sources that contribute instrument's signal. discusses science objectives, with focus SPICE-specific aspects, before...
Solar Orbiter is the first space mission observing solar plasma both in situ and remotely, from a close distance, out of ecliptic. The ultimate goal to understand how Sun produces controls heliosphere, filling System driving planetary environments. With six remote-sensing four in-situ instrument suites, coordination planning operations are essential address following top-level science questions: (1) What drives wind where does coronal magnetic field originate? (2) How do transients drive...
Coronal holes are areas on the Sun with open magnetic field lines. They a source region of solar wind, but how wind emerges from coronal is not known. We observed hole using Extreme Ultraviolet Imager Solar Orbiter spacecraft. identified jets scales few hundred kilometers, which last 20 to 100 seconds and reach speeds ~100 kilometers per second. The powered by reconnection have kinetic energy in picoflare range. intermittent widespread within hole. suggest that such could produce enough...
The spectra of solar wind magnetic fluctuations exhibit a significant power-law steepening at frequencies f > 1 Hz. origin this multiple scaling is investigated through dispersive Hall magnetohydrodynamics. We perform three-dimensional numerical simulations in the framework highly turbulent shell model and show that large-scale are characterized by k-5/3-type spectrum steepens scales smaller than ion inertial length di, to k-7/3 if energy overtakes kinetic energy, or k-11/3 opposite case....
Using Fourier and wavelet analysis, we critically re-assess the significance of our detection periodic pulsations in coronal loops. We show that proper identification frequency dependence statistical properties different components power spectra provies a strong argument against common practice data detrending, which tends to produce spurious detections around cut-off filter. In addition, white red noise models built into widely used code Torrence & Compo cannot, most cases, adequately...
Context. The Solar Orbiter spacecraft will be equipped with a wide range of remote-sensing (RS) and in situ (IS) instruments to record novel unprecedented measurements the solar atmosphere inner heliosphere. To take full advantage these new datasets, tools techniques must developed ease multi-instrument multi-spacecraft studies. In particular currently inaccessible low corona below two radii can only observed remotely. Furthermore used retrieve coronal plasma properties time three...
The European Union funded the FLARECAST project, that ran from January 2015 until February 2018. had a research-to-operations (R2O) focus, and accordingly introduced several innovations into discipline of solar flare forecasting. were: first, treatment hundreds physical properties viewed as promising predictors on equal footing, extending multiple previous works; second, use fourteen (14) different machine learning techniques, also to optimize immense Big Data parameter space created by...
Context. The Extreme Ultraviolet Imager (EUI), onboard Solar Orbiter consists of three telescopes: the two High Resolution Imagers in EUV (HRIEUV) and Lyman-{\alpha} (HRILya), Full Sun (FSI). Orbiter/EUI started its Nominal Mission Phase on 2021 November 27. Aims. EUI images from largest scales extended corona off limb, down to smallest features at base chromosphere. is therefore a key instrument for connection science that heart mission goals. Methods. highest resolution achieved when...
Context. Solar Orbiter is a new space observatory that provides unique capabilities to understand the heliosphere. In particular, it has made several observations of far-side Sun and therefore information can greatly improve weather monitoring. Aims. this study, we aim quantify how data will affect simulations corona interplanetary medium, especially in context forecasting. Methods. To do so, focused on time period with single sunspot emerging February 2021. We used two different input...
We study the formation and evolution of a turbulent spectrum Alfvén waves driven by reflection off solar wind density gradients, starting from coronal base up to 17 radii, well beyond Alfvénic critical point. The background is assigned two-dimensional shell models are used describe nonlinear interactions. find that spectra influenced nature reflected waves. Close base, these give rise flatter steeper for outgoing waves, respectively. At higher heliocentric distance both evolve toward an...
We study here the phenomena of decayless kink oscillations in a system active region (AR) coronal loops. Using high resolution observations from two different instruments, namely Extreme Ultraviolet Imager (EUI) on board Solar Orbiter and Atmospheric Imaging Assembly (AIA) Dynamics Observatory, we follow these AR loops for an hour each three consecutive days. Our results show significantly more resolved waves higher-resolution EUI data compared with AIA data. Furthermore, same exhibits many...
Relaxation of braided coronal magnetic fields through reconnection is thought to be a source energy heat plasma in active region loops. However, observations heating associated with an untangling braids remain sparse. One reason for this paucity could the lack sufficiently high spatial and temporal resolution capture process action. Using new (250-270 km on Sun) cadence (3-10 s) from Extreme Ultraviolet Imager (EUI) board Solar Orbiter, we observed small-scale different regions. The...
Context. To meet the scientific objectives of mission, Solar Orbiter spacecraft carries a suite in-situ (IS) and remote sensing (RS) instruments designed for joint operations with inter-instrument communication capabilities. Indeed, previous missions have shown that Sun (imaged by RS instruments) heliosphere (mainly sampled IS should be considered as an integrated system rather than separate entities. Many advances expected from rely on this synergistic approach between measurements. Aims....
The 3D fine structure of the solar atmosphere is still not fully understood as most available observations are taken from a single vantage point. goal paper to study distribution small-scale brightening events ("campfires") discovered in EUV quiet Sun by Extreme Ultraviolet Imager (EUI) aboard Solar Orbiter. We used first commissioning data set acquired EUI's High Resolution telescope on 30 May 2020 174 {\AA} passband and we combined it with simultaneous Atmospheric Imaging Assembly (AIA)...
A simplified non-linear numerical model for the development of incompressible magnetohydrodynamics (MHD) in presence a strong magnetic field B0 and stratification, nicknamed Shell-Atm, is presented. In planes orthogonal to mean field, dynamics replaced by 2D shell-models complex variables u b, allowing one reach large Reynolds numbers while at same time carrying out sufficiently long integrations obtain good statistics moderate computational cost. The different are coupled Alfven waves...
Quasi-constant heating at the footpoints of loops leads to evaporation and condensation cycles plasma: thermal non-equilibrium (TNE). This phenomenon is believed play a role in formation prominences coronal rain. However, it often discarded be involved warm as models do not reproduce observations. Recent simulations have shown that these inconsistencies with observations may due oversimplifications geometries models. In addition, our recent reveal long-period intensity pulsations (several...
Context. Coronal rain is the most dramatic cooling phenomenon of solar corona. Recent observations in visible and UV spectrum have shown that coronal a pervasive active regions. Its strong link with heating through thermal non-equilibrium (TNE) – instability (TI) scenario makes it an essential diagnostic tool for properties. Another puzzling feature corona addition to its filamentary structure variability, particularly extreme (EUV). Aims. We aim identify observable features TNE-TI...
Aims. We present an analysis of the first connection mosaic made by SPICE instrument on board ESA/NASA Solar Orbiter mission March 2, 2022. The data will be used to map coronal composition that compared with in-situ measurements taken SWA/HIS establish origin solar wind plasma observed at Orbiter. spectral lines were chosen have varying sensitivity ionization potential (FIP) effect, and therefore radiances vary significantly depending whether elemental is or photospheric. investigate link...
Context: On 2020 May 30, small and short-lived EUV brightenings were observed in the Quiet Sun (QS) during a four minutes sequence by EUI/HRIEUV on board Solar Orbiter. Their physical origin possible impact coronal or Transition Region (TR) heating are still to be determined. Aims: Our aim is derive statistical thermal evolution of these events order establish their TR origin. Methods. analysis takes advantage multithermal sensitivity Atmospheric Imaging Assembly (AIA) imager Dynamics...
Mini-filament eruptions are one of the most common small-scale transients in solar atmosphere. However, their eruption mechanisms still not understood thoroughly. Here, with a combination 174 A images high spatio-temporal resolution taken by Extreme Ultraviolet Imager on board Solar Orbiter and Atmospheric Imaging Assembly Dynamics Observatory, we investigate detail an erupting mini-filament over weak magnetic field region 2022 March 4. Two bright ribbons clearly appeared underneath as it...